Left-side ear-radical: this position represents
阜 'mound, terraced hill,' not the right-side
邑 'city.' Indexes
阮 in the mound/place-name family with
阳 sunny side,
阴 shady side,
阶 step,
院 courtyard.
阮 originally named an ancient state and a mountain, so the mound radical anchors the geographic sense.